So I bought this for my Nexus 7 to have expanded storage via USB key. The issue was that the connector is TOO SMALL! What i mean by that is the side with the microusb doesn't extend far enough. when i put it into my nexus 7, the nexus 7 doesn't detect it. (because its not in deep enough, har har) anyways, i grabbed a knife and cut the rubber around the microusb end to expose the tip more. plugged in it, and voilà, working perfectly.
since i had to do a little chiselling, i will give this a 4 star instead of 5. otherwise no issue found.
this issue might occur for other products like galaxy nexus, w/e other android devices. just cut it with a knife.